.page-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  .icon-zfb {
    width: 32px;
    height: 32px;
    background: url(https://zos.alipayobjects.com/rmsportal/sifuoDUQdAFKAVcFGROC.svg) center center / 21px 21px no-repeat;
    &-selected {
      width: 32px;
      height: 32px;
      background: url(https://zos.alipayobjects.com/rmsportal/iSrlOTqrKddqbOmlvUfq.svg) center center / 21px 21px no-repeat
    }
  }
}